Hi,
Yes, you can configure Data VLAN ID (which is called Default Port VID in PMP 450)in ePMP force 180 and this option is available under Configuration >> Network >>Virtual Local Area Network (VLAN)>>Data VLAN>>enable and configure Data VLAN ID.
SM will tag the untagged traffic coming from the SM LAN end with this data vlan Id and send it to the wireless interface.
For more information about VLAN options in ePMP ,you can refer the link as mentioned below: